Sharing a Model between a JList and JComboBox : List « Swing JFC « Java

1. Java
2. Swing JFC
3. List

Sharing a Model between a JList and JComboBox

 
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.ComboBoxModel;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.ListCellRenderer;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

public class ListIt {

  final String partsList[][] = { { "Item 1", "10", "99c" },
      { "Item 2", "12", "$18.99" }, { "Item 3", "1", "$10.00" } };

  class PartsListModel extends DefaultListModel implements ComboBoxModel {

    Object currentValue;

    public PartsListModel() {
      for (int i = 0, n = partsList.length; i < n; i++) {
        addElement(partsList[i]);
      }
    }

    // ComboBoxModel methods
    public Object getSelectedItem() {
      return currentValue;
    }

    public void setSelectedItem(Object anObject) {
      currentValue = anObject;
      fireContentsChanged(this, -1, -1);
    }
  }

  class MyLabelRenderer extends JLabel implements ListCellRenderer {
    public MyLabelRenderer() {
      setOpaque(true);
    }

    public Component getListCellRendererComponent(JList list, Object value,
        int index, boolean isSelected, boolean cellHasFocus) {
      if (value != null) {
        String values[] = (String[]) value;
        String setting = values[0] + " / " + values[1] + " / "
            + values[2];
        setText(setting);
      }
      setBackground(isSelected ? Color.BLUE : Color.WHITE);
      setForeground(isSelected ? Color.WHITE : Color.BLUE);
      return this;
    }
  }

  public ListIt() {
    JFrame f = new JFrame();
    final PartsListModel pcm = new PartsListModel();
    ListCellRenderer lcr = new MyLabelRenderer();
    JList jl = new JList(pcm);
    jl.setCellRenderer(lcr);
    ListSelectionModel lsm = jl.getSelectionModel();
    lsm.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    jl.addListSelectionListener(new ListSelectionListener() {
      public void valueChanged(ListSelectionEvent e) {
        if (!e.getValueIsAdjusting()) {
          String element[] = (String[]) pcm.getElementAt(e
              .getFirstIndex());
          System.out.println(element[0] + " : " + element[1] + " : "
              + element[2]);
        }
      }
    });
    JScrollPane jsp = new JScrollPane(jl);
    JComboBox jc = new JComboBox(pcm);
    jc.setRenderer(lcr);
    JButton jb = new JButton("Add Merchandise");
    jb.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        pcm.addElement(partsList[(int) (Math.random() * partsList.length)]);
      }
    });
    Container c = f.getContentPane();
    c.add(jsp, BorderLayout.NORTH);
    c.add(jc, BorderLayout.CENTER);
    c.add(jb, BorderLayout.SOUTH);
    f.setSize(250, 250);
    f.show();
  }

  public static void main(String args[]) {
    new ListIt();
  }
}


           
         
  

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